Sunan Abi Dawud 4867
سنن أبي داود#4867SahihSa’id b. al-musayyab said :‘Umar b. al-khattab and ‘Uthman b. ‘Affan used to do that
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih Isnaad
Muhammad Muhyi Al-Din Abdul HamidSahih Isnaad
Zubair Ali ZaiSahih Bukhari (475)
In-book reference: 43:95